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15 gm Ba(MnO4)2 sample containing inert ...

15 gm `Ba(MnO_4)_2` sample containing inert impurity is completely reacting with 100 ml of 11.2 V' `H_2O_2`, then what will be the % purity of `Ba(MnO_4)_2` in the sample ?
(Atomic mass Ba=137, Mn=55)

A

`5%`

B

`10%`

C

`50%`

D

none

Text Solution

Verified by Experts

The correct Answer is:
C
Normality of `H_2O_2=11.2/5.6N`
milli equivalents `Ba(MnO_4)_2` reacted=milli equivalents of `H_2O_2` reacted =2x100=200 meq=0.2 gram eq
Moles of `Ba(MnO_4)_2implies0.2/10=0.02 " " :. Wt. of Ba(MnO_4)_2=0.02xx375`
% purity of `Ba(MnO_4)_2=(375xx0.02)/15xx100=50%`
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H_(2)O_(2) acts as both oxidising and reducing agent. As oxidising agent, its product is H_(2)O but as redusing agent, its product is O_(2) . Volume strength has great significance for chemical reactions. The strength of '10 V means 1 volume (or litre) of H_(2)O_(2) on decomposition (H_(2)O_(2) rarr H_(2)O+1/2 O_(2)) gives 10 volumes (or litre) of oxygen at NTP. 15 g Ba(MnO_(4))_(2) sample containing inert impurity is completely reacting with 100 mL of '11.2 V' H_(2)O_(2) , then what will be the % purity of Ba(MnO_(4))_(2) in the sample: (Atomic mass: Ba=137, Mn=55)

The strength of H_(2)O_(2) is expressed in several ways like molarity, normality,% (w/V), volume strength, etc. The strength of "10 V" means 1 volume of H_(2)O_(2) on decomposition gives 10 volumes of oxygen at 1 atm and 273 K or 1 litre of H_(2)O_(2) gives 10 litre of O_(2) at 1 atm and 273 K The decomposition of H_(2)O_(2) is shown as under : H_(2)O_(2)(aq) to H_(2)O(l)+(1)/(2)O_(2)(g) H_(2)O_(2) can acts as oxidising as well as reducing agent. As oxidizing agent H_(2)O_(2) is converted into H_(2)O and as reducing agent H_(2)O_(2) is converted into O_(2) . For both cases its n-factor is 2. :. "Normality " "of" H_(2)O_(2) " solution " =2xx "molarity of" H_(2)O_(2) solution 40 g Ba(MnO_(4))_(2) (mol.mass=375) sample containing some inert impurities in acidic medium completely reacts with 125 mL of "33.6 V" of H_(2)O_(2) . What is the percentage purity of the sample ?

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